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Statement of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Changes in Shareholders' Deficit [Abstract]      
Shareholders’ deficit - opening balance $ (41,879) $ (18,274) $ (173,978)
Net (loss) / gain from operations (154,356) 3,936 77,476
Adjustment of redeemable Shares to redemption value 196,235 (27,541) 78,228
Shareholders’ deficit - closing balance $ 0 $ (41,879) $ (18,274)